Improvement in burglar-alarms



from the exterior, but which allows the plug to play through it. This plug m extends far enough through the inner door to be struck by the outer door when it is closed, which movement pushes in the trigger D until the dog b drops into the recess a, where it may remain. This sets the alarm. y

Now, if the outer door-G of the vault be opened, forcibly or otherwise, when the alarm mechanism is set as above, the spring o on the trigger D, expanding, shoots out thetrigger, and the trigger in tum moves the level E out from under the escape-levers e f, and the trains of gears are let off, each sounding an alarm. If it be desirable to open the vault without letting off the alarms, it is only necessary, by means ofthe cord c, to draw the dog b ont of the notch a, which disconnects the trigger from. the alarm mechanism.

The plug m and sleeve fn are removable and replaceable at pleasure. They maybe laid 'aside during the day, when the vault is used by the authorized persons, but when` it is to heclosed and set, lthen the plug and sleeveare put in their proper position, as shown in fig. 2, and when the outer door G is-closed, the alarm is set, and will go o the moment said door is opened.

Having thus fully described my invention- .1. In combination with the spring-trigger D, the plug m, for making a connection between said trigger and the outer door G, and so as to set and let o said trigger by the closing and opening of said door, suhst-antially as described. Y

2. In combination withthc trigger, door, and plug, ,the sleeve n around 'said plug, tovpreveut the latter from being reached and held from the exterior of lthe door, should it be bored for that purpose, substantially as described.

A3. In combination witha spring-trigger set and let-V o", as herein described, the hinged-lever E, and the escape-levers e f resting thereon, for the purpose of letting o'byone operation two alarms remote from each other, as and for the purpose described and rcpresented.

MARSHALL J'. HUNT.

Witnesses:

J Esse A. KIRK, JOB HAINEs. 

